Unit 3 concept 4 Flashcards
All organisms need a
constant supply of energy to survive
For most life on earth the ultimate source of energy is
the sun
organisms convert that energy source into
something usable which is accomplished by photosynthesis
Photosynthesis
overall process by which sunlight (solar/light energy), water, and carbon dioxide are chemically converted into chemical energy stored in glucose (sugar/carbohydrate)
Photosynthesis equation
6CO2 + 6H2O -> C6H12O6 + 6O2
Reactants are known as
ingredients
Reactants of photosynthesis
CO2 (carbon dioxide) and H2O (water)
Products are the
results
products of photosynthesis
C6H12O6 (glucose) and O2 (oxygen)
Grana
pancake-like stacks of thylakoid membrane
Stroma
fluidlike substance that fills the space between the grana
Two stages of photosynthesis (happens in chloroplast)
- Light dependent reaction “photo”
- Light independent reaction (dark reaction, Calvin cycle) “synthesis”
Light dependent reaction
Requires solar energy
purpose of light dep. RXN
capture energy from the sun and store energy in “energy carrying molecules”
ATP and NADPH
Location of light dep. RXN
occurs in the grana (in the thylakoid membrane) where the chlorophyll is stored. The chlorophyll is the pigment that captures sunlight
in the ligh dep. rxn, Energy from the sun is passed down the
electron transport chain (ETC) and is stored in the bonds of ATP and NADPH
water molecules in the light dep. rxn are
split into hydrogen and oxygen
oxygen is released as a waste product
ATP and NADPH leave
the grana and go into the stroma for the next stage (calvin cycle)
Light independent reaction
Does not require any solar energy
Purpose of light ind. rxn
Use the energy from the “energy carrying molecules” from the light dependent reactions to make glucose
Location of light ind. rxn
occurs in the stroma
List the significant events of the light-independent reaction (Calvin Cycle.) Include which reactants and products are involved. Highlight what will be released as a product and what will move on to continue in the cycle. Be sure to include where the process occurs in the chloroplast.
draw out
